131033993 has 4 divisors (see below), whose sum is σ = 135260928. Its totient is φ = 126807060.

The previous prime is 131033971. The next prime is 131033999. The reversal of 131033993 is 399330131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399330131 = 367 ⋅1088093.

It is a cyclic number.

It is not a de Polignac number, because 131033993 - 2¹⁶ = 130968457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131033999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113421 + ... + 2113482.

It is an arithmetic number, because the mean of its divisors is an integer number (33815232).

Almost surely, 2^131033993 is an apocalyptic number.

It is an amenable number.

131033993 is a deficient number, since it is larger than the sum of its proper divisors (4226935).

131033993 is an equidigital number, since it uses as much as digits as its factorization.

131033993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226934.

The product of its (nonzero) digits is 6561, while the sum is 32.

The square root of 131033993 is about 11447.0080370375. The cubic root of 131033993 is about 507.9192332898.

The spelling of 131033993 in words is "one hundred thirty-one million, thirty-three thousand, nine hundred ninety-three".